don't support contain other view

[captain-miao]

like this:

            <com.yalantis.jellytoolbar.widget.JellyToolbar
                android:id="@+id/toolbar_main"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:cancelIcon="@android:drawable/ic_menu_close_clear_cancel"
                app:icon="@android:drawable/ic_menu_search">
                <Spinner
                    android:id="@+id/spinner_nav"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:clipToPadding="false"/>
            </com.yalantis.jellytoolbar.widget.JellyToolbar>